Electrical telemetering system



Dec. 18 1945. F. J. LINGEL 2,391,057

ELECTRICAL TELEMETER ING SYSTEM Original Filed Aug. 23, 1940 IN V EN TOR. firm-mew JZ/maez a my, lirragjvz .umrsn v srArss.rArsaT :orncs 2,391,051 Ohio, minor to v The Liguidometer Corporation, Long Island 7 (my, N. 1., a corporation of Delaware application Aim 2:, 1940, Serial No.-

Original assass- Divided and um application October 31, 1944, Serial No. 561,264

4 Claims. (Cl. 177-351 7 The present application relates to an electrical Referring to the drawing: telemeterlng system by which data or indications The single figure of the drawing is a wiring having their 8111 at one point are transmitted diagram in which the electrical connections are to a distant point and there indicated on a suitsuch that the normal scale deflection produced able instrument. 7 I by twp coils; may be varied by the use of a third The present application is a division of my coil, which may be dlflerentially wound.v prior and copending application Serial No. It will be understood that while there is illus- 353,783, filed August 23, 1840, entitled "Electrical trated in the drawing and described hereinafter instruments and systems, which application has a wiring diagram and while the drawing shows now been abandoned and the subject matter diagrammatically only certain structural features v thereof'carried forward ina continuing applicaof the invention, this structure, particularly the tion. Serial No. 567,848, filed December 12, 1944. receiver of the telemetering system. may be conjl'he present application relates to the subject structed-in any recognized and known way apmatter disclosed in the specification of my orig-' plicable to' telemeterin'g systems of this general jnal application above identified and illustrated 15 type, that" is, systems wherein the receiver inin Fig, 2 of the drawing thereof which is the cludes a rotor or one or more parts carried same as the present figure of drawing. Only so thereby and permanently magnetized transverse -much of the original disclosure as will afford a to its axis of rotation. The rotor thus conproper understanding of the subject matter Q structed rotates freely within a structure having shown in this figure is included in the present associated therewith outside the rotor a plurality application. The claims of the present applicaof coils which will set up a magnetic fiux intion are limited to subject matter readable on financing the position of the rotor. Such a structhis figure as distinguished from claims readture is,-'disclosed, for'example, in my parent apable on other figures of .the parent application. plication Serial No. 353,783, of which the present v Certain features of the present invention are all application is adivision, Inasmuch, howevenas disclosed also in my patent entitled "Electrical these structures, from a broad point of view, are translating instruments or devices," No. 2,339,021, known in the art, it has not been thought necesgranted January 11, 1944, which was copending sary further to illustrate or describe them in dewith the above identified application Serial No. tail in the present application. 353,783, of which this application is a division. Referring now particularly to the accompany- Among the objects of the present invention are ing drawing, I have shown a combination to provide a telemetering system and particularly wherein a, receiver is provided having a rotor a receiver therefor, wherein an indicating pointer generally indicated at ll, which as has been set is caused to move through an are which will torthis adapted to be permanently magnetized usually be somewhat less than 180 and may be. transverse to its axis of rotation'and which is f r x pl about 120' n P rt ly wh in suitably mountedv in anti-friction bearings and the amplitude or total degree of arcuate swing carries rigidtherewith a pointer 28 adapted for of the pointer may be predetermined at a desired visual cooperation with a scale diagrammatically amount. indicated at 28, l 'or'the purpou of influencing Other objects and advantages of my invention. the position of the rotor It and hence that of will be stated hereinafter or will appear to those the pointer 23, there are provided two coils l2, skilled in the art upon reading the followingv which are arranged preferablyat about 120 to description of the invention and of the manner "one another and with their axes substantially and process of making, constructing, compoundradial in respectto the rotor (the upper coils ing, and using it, and I shall also explainherein shown on the drawing). It will be understood what I now believe to be the principle thereof, that-these coils are located outside the peripheral and the best mode in which I have contemplated boundary of the rotor loin the receiving instruapplying that principle. v ment and are connected as shown in the drawing. Desiring to have it understood that my inven A third coil, also generally designated at 32 but tion maybecarriedoutbyothermeans'and with including two portions m and m, is shown other apparatus, and that it may be used in other diagrammatically on the accompanying drawing. environments and forother purposes, I shall This coil is preferably also disposed as described now proceed to describe what I now consider for the other coils 32, that is, outside the periphto be a preferred form of apparatus for practiceral boundary of therotor In and with its axis a substantially radial in respect thereto. As

lower or verticallydisposed coil 32, including the coil portions I32 and 232 is provided for the purpose of controlling or predetermining the amplitude 'of movement of the pointer 26 under the influence of the first named coils 32. For this purpose the two'sections I32 and 232 are preferably wound in opposite directionaso as to op-' pose one another. By connecting coil 32 to a source of E. M. F. and by providing more turns in one of the opposing sections I32, 232 than in the other of said sections, the full scale deflection of the pointer 26 may be made greater or less than 120 to an extent depending upon the difi'erence between the numbers of turns in the two sections.

When the number of turns of either section I32,

232 is greater than that of the other ,of said sec tions, the electrical connection of the differential coil 32 (I32-232) with respect to the other two coils 32, 32 determines whether the full scale deflection of the pointer 26 is greater or less than 120". If the predominant effect of the coil combination (I32--232) is bucking with respect to the other coils 32, 32, the full scale deflection will be less than 120 to an extent, as stated above, depending upon' the difference between the num-' bers of turns of the two sections I32, 232. On the other. hand, if the predominant effect of the coil combination (I32--232) is cumulative Whatever the selected full scale deflection may be, the scale 28 is so calibrated and the design is such that the pointer 26 will indicate upon the scale 28 the remote liquid level indicated by the float 66 or such other condition; as may be suitably connected thereto in a way which will be apparent to those skilled in the art.

In order thatshort circuits across the line I12 at the transmitting station, or between the transmitting station and the indicating instrument, shall not damage the battery or so reduce its terminal E. M. F. as to render the operation of other instruments connected to the same line or source inaccurate and unreliable, I provide a protectiveresistance 83, mentioned above, and connected as shown. The resistance of this element 83 is such, withrespect to the electrical constants of the rest of the system, as to prevent the undesirable consequences, spoken of above, that might otherwise result.

While other electrical constants may be employed, I have found that the following will give.

with the predominant effect bucking with respect with respect to the other coils 32, 32, thefull scale deflection will be greater than 120 to an extent depending upon the difference between the numbers of turns of the two sections I32, 232.

As shown, the instrument is adapted to be actuated to indicate the level of a liquid in a container. For this purpose as is diagrammatically illustrated, there is provided a float 50, which is arranged to float upon a liquidindicated diagrammatically in the drawing, this float being carried by an arm 48. This arm is suitably arrangedin a manner known to the art to vary the position of a contact member 46 along a resistance strip or potentiometer coil 82. The connections are such that the instrument just described will indicate by the position of the pointer 26 with respect to the scale 28 the position of the contactor 46 along the resistance strip 82, which in turn is responsive' to the level of the liquid as indicated by the position of. the float 58.

While the system has beendiagrammatically illustrated to indicate liquid level in a container, it will be understood that any other condition suitably arranged to actuate amovable element, which maybe anjelectrical contactor and which contactor is movable along a resistance strip or potentiometer coil as shown 'at 82, maybe similarly indicated by the system of the present application. This application is therefore, notintended to be limited to liquid level indication.

' The resistance strip 82 is electrically connected across the line I12 (preferably through a resistance, 83"hereinafter described) supplied by a suitable source of direct current E. M. F. The float controlled contact member 46 is electrically connected to the outer end of the upper right hand coil 32 and to the inner end of the upper left hand coil 32. Theouter end of the upper left hand coil 32 is electrically connected to the upper end of' the resistance strip 82 and to the inner end of the composite coil 32 I32--232). The inner end of the upper right hand coil 32 is electrically connected to the lower end of the resistance strip 82 and to the outer end of the composite coil 32 (I32-232).

to the other two coils 32, 32. The E. M. F. at I12 is twelve, volts.

In come cases and by proper selection of electrical constants, more than one indicator may be reliably controlled by the same transmitter by connecting the indicating instruments in parallel. For example, as shown in the drawing, a second receiving instrument'which maybe identical with that hereinabove described and diagrammatically illustrated in the drawing, may be electrically connected inparallel'therewith across the leads or conductors 30 and the positive side of the current supply line I12. Reliability in indication has been attained in such use of a plurality of indicating or receiving instruments by virtue of the comparatively high resistance ofthe'coils 32 and I32,"232 with respect to theresistance of the potentiometer or resistor 82.

' While I have shown and described but one em bodlment of the present invention, it is understood that the principles herein disclosed may advantageously be used in other physical embodiments thereof,.I do not wish to be limited, therefore except by the scope of the appended claims, which are to 'be' construed validly as broadly as the state of. theprior art permits. What is claimedis: 1 An indicating instrument comprising, in combination, a permanently magnetized cylindrical rotor, and a plurality of angularly spaced coils mounted with their fluxaxes radial with respect to said rotor, one of said coils having mutually opposing windings for varyingthe'range of actuation of. said rotorby the other coils, said windings having an unequal number of turns,,a source of E. M. F., and means including a potentiometer for variably .energizingsaid coilsfrom said source of E. M. F.

2. An indicating instrument including ,a :per-

current from said sourceof E. M. F., and elecescape? trical connections includins a control device for m flnltheothcrcoilswithvarlablecurrent from said source of E. M. 1".

3. Anindieating instrument. comprising a rotor permanently in a direction transverse of its axis of rotation, least, two coils disposed with their axes at substantial angles to each other and spaced radially from the axis oi rotation of said rotor, electrical connections and a source 01' E. M. I". for transmitting variable currents to said coils and thereby i'or controllln: the annular position oi said rotor within a total amplitude of movement oi. less than 180', and another coil disposed in magnetic association with said rotor. and means connectins said other coil to a cut nasned coils.

FREDERICK J. LINGEL. 

